Aboriginal Australians

Humans first migrated to Australia 50,000 to 65,000 years ago, and over time formed as many as 500 linguistic and territorial groups. Aboriginal people once lived across large areas of the continental shelf that were later inundated by postglacial sea-level rise at the start of the Holocene inter-glacial period, reshaping coastal landscapes and separating Tasmania from the mainland. Aboriginal people maintained extensive networks within the continent and certain groups maintained relationships with Torres Strait Islanders and the Makassar people of modern-day Indonesia.

Over the millennia, Aboriginal people developed complex trade networks, inter-cultural relationships, law and religions, which make up some of the oldest continuous cultures in the world. At the time of European colonisation of Australia, the Aboriginal people spoke more than 250 different languages, possessed varying degrees of technology, and lived in various types of settlements. Languages (or dialects) and language-associated groups of people are connected with stretches of territory known as "Country", with which they have a profound spiritual connection.

Contemporary Aboriginal beliefs are shaped by traditional beliefs, the disruption of colonisation, religions brought to the continent by later migrants, and contemporary issues. Just over half hold secular or other spiritual beliefs or no religious affiliation; about 40% are Christian; and about 1% adhere to a traditional Aboriginal religion. Traditional cultural beliefs are passed down and shared through dancing, stories, songlines, and art that collectively weave an ontology of modern daily life and ancient creation known as the Dreaming.

Studies of Aboriginal groups' genetic makeup are ongoing, but evidence suggests that they have genetic inheritance from ancient Asian peoples. Aboriginal Australians and Papuans shared the same paleocontinent Sahul, although they became genetically distinct about 37,000 years ago. Aboriginal Australians have a broadly shared, complex genetic history, but only in the last 200 years have they been defined by others as, and started to self-identify as, a single group. Aboriginal identity has changed over time and place, with family lineage, self-identification, and community acceptance all of varying importance.

The 2021 census shows that there were 944,171 Aboriginal people, comprising 3.7% of Australia's population. Over 80% of Aboriginal people today speak English at home, and about 77,000 speak an Indigenous language at home. Aboriginal people, along with Torres Strait Islander people, suffer a number of severe health and economic deprivations in comparison with the wider Australian community.

Origins

Archeological evidence indicates that the ancestors of today's Aboriginal Australians first migrated to the continent 50,000 to 65,000 years ago. While there have been genomic studies placing arrival as late as 43,000 years ago, a 2025 study suggests that the peopling of Australia happened around 60,000 years ago, via two distinct routes. These settlers formed part of a single migration that diverged in Southeast Asia; they were ancestral to the Indigenous populations of Australia, New Guinea and Oceania, and were related to other East Eurasians rather than representing a separate wave.

Early human migration to Australia was achieved when it formed a part of the Sahul continent, connected to the island of New Guinea via a land bridge. This would have nevertheless required crossing the sea at the Wallace Line. It is also possible that people came by island-hopping via an island chain between Sulawesi and New Guinea, reaching North Western Australia via Timor. As sea levels rose, the people on the Australian mainland and nearby islands became increasingly isolated, some on Tasmania and some of the smaller offshore islands when the land was inundated at the start of the Holocene, the inter-glacial period that started about 11,700 years ago.

A 2021 study by researchers at the Australian Research Council Centre of Excellence for Australian Biodiversity and Heritage has mapped the likely migration routes of the peoples as they moved across the Australian continent to its southern reaches of what is now Tasmania (then part of the mainland). The modelling is based on data from archaeologists, anthropologists, ecologists, geneticists, climatologists, geomorphologists, and hydrologists. The new models suggest that the first people may have landed in the Kimberley region in what is now Western Australia about 60,000 years ago, and had settled across the continent within 6,000 years.

Aboriginal Australians may have one of the oldest continuous cultures on earth. In Arnhem Land in the Northern Territory, oral histories comprising complex narratives have been passed down by Yolngu people through hundreds of generations. The Aboriginal rock art, dated by modern techniques, shows that their culture has continued from ancient times.

Genetics

Genetic studies have revealed that a population wave, termed East Eurasian Core, outgoing from the Iranian plateau during the Initial Upper Paleolithic period populated the Asia-Pacific region via a southern route dispersal. This wave is suggested to have expanded into the South and Southeast Asia region and subsequently diverged rapidly into the ancestors of Ancient Ancestral South Indians (AASI), Andamanese, East Asians, and Australasians, including Aboriginal Australians and Papuans. Aboriginal Australians are genetically most closely related to other Oceanians, such as Papuans and Melanesians, who are collectively referred to as "Australasians," which can be described as "a deeply branching East Asian lineage".

While the commonly accepted date for the diversification of modern humans following the Out of Africa migration is placed at 60–50,000 years ago, there is, however, evidence that Aboriginal Australians may carry ancestry from an earlier human diaspora (xOoA) that originated 75,000 to 62,000 years ago. This earlier group has been estimated to have possibly contributed around 2% ancestry to modern Aboriginal Australians.

Mallick et al. 2016 and Mark Lipson et al. 2017 found the bifurcation of Eastern Eurasians and Western Eurasians dates to at least 45,000 years ago, with indigenous Australians nested inside the Eastern Eurasian clade. Aboriginal Australians, together with Papuans, may either form a sister clade to a single mainland Asian clade consisting of the AASI, Andamanese and East Asians, and to the exclusion of West Eurasians, or alternatively are nested within the Eastern Eurasian cluster without a strong internal cladal structure against mainland Asian lineages.

Genetic data on indigenous populations of Borneo and Malaysia showed them to be more closely related to other mainland Asian groups, than compared to the groups from Papua New Guinea and Australia. This indicates that populations in Australia were isolated for a long time from the rest of Southeast Asia. They remained untouched by migrations and population expansions into that area, which can be explained by the Wallace line.

Uniparentals

The most common Y-chromosome haplogroups among Aboriginal Australians is C1b2, followed by haplogroups S and M; these latter haplogroups are also very frequent among Papuans.

Other studies

In a 2001 study, blood samples were collected from some Warlpiri people in the Northern Territory to study their genetic makeup (which is not representative of all Aboriginal peoples in Australia). The study concluded that the Warlpiri are descended from ancient Asians whose DNA is still somewhat present in Southeastern Asian groups, although greatly diminished. The Warlpiri DNA lacks certain information found in modern Asian genomes, and carries information not found in other genomes. This reinforces the idea of ancient Aboriginal isolation.

Genetic data extracted in 2011 by Morten Rasmussen et al., who took a DNA sample from an early-20th-century lock of an Aboriginal person's hair, found that the Aboriginal ancestors probably migrated through South Asia and Maritime Southeast Asia, into Australia, where they stayed. As a result, outside of Africa, the Aboriginal peoples have continuously occupied the same territory longer than any other human populations. These findings suggest that modern Aboriginal Australians are the direct descendants of the eastern wave, who left Africa up to 75,000 years ago.

The Rasmussen study also found evidence that Aboriginal peoples carry some genes associated with the Denisovans (a species of human related to but distinct from Neanderthals) of Asia; the study suggests that there is an increase in allele sharing between the Denisovan and Aboriginal Australian genomes, compared to other Eurasians or Africans. Examining DNA from a finger bone excavated in Siberia, researchers concluded that the Denisovans migrated from Siberia to tropical parts of Asia and that they interbred with modern humans in Southeast Asia 44,000 years BP, before Australia separated from New Guinea approximately 11,700 years BP. They contributed DNA to Aboriginal Australians and to present-day New Guineans and an indigenous tribe in the Philippines known as Mamanwa. This study confirms Aboriginal Australians as one of the oldest living populations in the world. They are possibly the oldest outside Africa, and they may have the oldest continuous culture on the planet.

A 2016 study at the University of Cambridge suggests that it was about 50,000 years ago that these peoples reached Sahul (the supercontinent consisting of present-day Australia and its islands and New Guinea). The sea levels rose and isolated Australia about 10,000 years ago, but Aboriginal Australians and Papuans diverged from each other earlier, genetically, about 37,000 years BP, possibly because the remaining land bridge was impassable. This isolation makes the Aboriginal people the world's oldest culture. The study also found evidence of an unknown hominin group, distantly related to Denisovans, with whom the Aboriginal and Papuan ancestors must have interbred, leaving a trace of about 4% in most Aboriginal Australians' genome. There is, however, increased genetic diversity among Aboriginal Australians based on geographical distribution.

Carlhoff et al. 2021 analysed a Holocene hunter-gatherer sample ("Leang Panninge") from South Sulawesi, which shares high amounts of genetic drift with Aboriginal Australians and Papuans. This suggests that a population split from the common ancestor of Aboriginal Australians and Papuans. The sample also shows genetic affinity with East Asians and the Andamanese people of South Asia. The authors note that this hunter-gatherer sample can be modelled with ~50% Australian/Papuan-related ancestry and either with ~50% East Asian or Andamanese Onge ancestry, highlighting the deep split between Leang Panninge and Aboriginal/Papuans.

Two genetic studies by Larena et al. 2021 found that Philippines Negrito people split from the common ancestor of Aboriginal Australians and Papuans before the latter two diverged from each other, but after their common ancestor diverged from the ancestor of East Asian peoples. Like Papuans, it's believed that Aboriginal Australians underwent a secondary admixture event with Altai-related Denisovan populations after they diverged from the ancestors of East Asians, who already mixed with Denisovans. This event was also separate from the admixture event experienced by Filipino Negritos, explaining why Aboriginal Australians and Papuans have relatively lower Denisovan ancestry.

Based on a reevaluation of mitogenomes, Gandini et al. 2025 proposed a "long chronology", which suggested an earlier settlement of Sahul by two migration routes about ~60 ka. One route came from northern Sunda via the Philippine archipelago whilst the other came from southern Sunda via Mainland Southeast Asia, with both routes ultimately tracing back to South Asia. The settlers that undertook these routes were ancestral to populations indigenous to Australia, New Guinea and Oceania, and were also related to other East Eurasians instead of belonging to a separate wave.

Changes about 4,000 years ago

The dingo reached Australia about 4,000 years ago. Near that time, there were changes in language (with the Pama-Nyungan language family spreading over most of the mainland), and in stone tool technology. Smaller tools were used. Human contact has thus been inferred, and genetic data of two kinds have been proposed to support a gene flow from India to Australia: first, signs of South Asian components in Aboriginal Australian genomes, reported on the basis of genome-wide SNP data; and second, the existence of a Y chromosome (male) lineage, designated haplogroup C∗, with the most recent common ancestor about 5,000 years ago.

The first type of evidence comes from a 2013 study by the Max Planck Institute for Evolutionary Anthropology using large-scale genotyping data from a pool of Aboriginal Australians, New Guineans, island Southeast Asians, and Indians. It found that the New Guinea and Mamanwa (Philippines area) groups diverged from the Aboriginal about 36,000 years ago (there is supporting evidence that these populations are descended from migrants taking an early "southern route" out of Africa, before other groups in the area). Also the Indian and Australian populations mixed long before European contact, with this gene flow occurring during the Holocene (c. 4,200 years ago). The researchers had two theories for this: either some Indians had contact with people in Indonesia who eventually transferred those Indian genes to Aboriginal Australians, or a group of Indians migrated from India to Australia and intermingled with the locals directly.

However, a 2016 study in Current Biology by Anders Bergström et al. excluded the Y chromosome as providing evidence for recent gene flow from India into Australia. The study authors sequenced 13 Aboriginal Australian Y chromosomes using recent advances in gene sequencing technology. They investigated their divergence times from Y chromosomes in other continents, including comparing the haplogroup C chromosomes. They found a divergence time of about 54,100 years between the Sahul C chromosome and its closest relative C5, as well as about 54,300 years between haplogroups K*/M and their closest haplogroups R and Q. The deep divergence time of 50,000-plus years with the South Asian chromosome and "the fact that the Aboriginal Australian Cs share a more recent common ancestor with Papuan Cs" excludes any recent genetic contact.

The 2016 study's authors concluded that, although this does not disprove the presence of any Holocene gene flow or non-genetic influences from South Asia at that time, and the appearance of the dingo does provide strong evidence for external contacts, the evidence overall is consistent with a complete lack of gene flow, and points to indigenous origins for the technological and linguistic changes. They attributed the disparity between their results and previous findings to improvements in technology; none of the other studies had utilised complete Y chromosome sequencing, which has the highest precision. For example, use of a ten Y STRs method has been shown to massively underestimate divergence times. Gene flow across the island-dotted 150-kilometre-wide (93 mi) Torres Strait, is both geographically plausible and demonstrated by the data, although at this point it could not be determined from this study when within the last 10,000 years it may have occurred—newer analytical techniques have the potential to address such questions.

Bergström's 2018 doctoral thesis looking at the population of Sahul suggests that other than relatively recent admixture, the populations of the region appear to have been genetically independent from the rest of the world since their divergence about 50,000 years ago. He writes "There is no evidence for South Asian gene flow to Australia .... Despite Sahul being a single connected landmass until [8,000 years ago], different groups across Australia are nearly equally related to Papuans, and vice versa, and the two appear to have separated genetically already [about 30,000 years ago]."

Environmental adaptations

Aboriginal Australians possess inherited abilities to adapt to a wide range of environmental temperatures in various ways. A study in 1958 comparing cold adaptation in the desert-dwelling Pitjantjatjara people compared with a group of European people showed that the cooling adaptation of the Aboriginal group differed from that of the Europeans, and that they were able to sleep more soundly through a cold desert night. A 2014 Cambridge University study found that a beneficial mutation in two genes that regulate thyroxine, a hormone involved in regulating body metabolism, helps to regulate body temperature in response to fever. The effect of this is that the desert people are able to have a higher body temperature without accelerating the activity of the whole of the body, which can be especially detrimental in childhood diseases. This helps protect people to survive the side-effects of infection.